Telit Wireless Solutions 1vv0300773a manual GSM Antenna Requirements

Page 33

GE863-PRO3Hardware User Guide

1vv0300773a Rev. 0 - 24/01/08

6 Antenna

The antenna connection and board layout design are the most important part in the full product design and they strongly reflect on the product overall performances, hence read carefully and follow the requirements and the guidelines for a proper design.

6.1 GSM Antenna Requirements

As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE863- PRO3 device shall fulfil the following requirements:

	ANTENNA REQUIREMENTS

Frequency range		Depending by frequency band(s) provided by
		the network operator, the customer shall use
		the most suitable antenna for that/those
		band(s)
Bandwidth		70 MHz in GSM850, 80 MHz in GSM900,
		170 MHz in DCS & 140 MHz PCS band
Gain		Gain < 3dBi
Impedance		50 Ω
Input power		> 2 W peak power
VSWR absolute		<= 10:1
max
VSWR		<= 2:1
recommended

When using the Telit GE863-PRO3, since there's no antenna connector on the module, the antenna must be connected to the GE863-PRO3through the PCB with the antenna pad using a 50 Ω transmission line.

In the case that the antenna is not directly developed on the same PCB, hence directly connected at the antenna pad of the GE863-PRO3, then a PCB line is needed in order to connect with it or with its connector.

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved

page 33 of 64

Image 33

Contents GE863-PRO3Hardware User Guide Contents GE863-PRO 3 Hardware User Guide This document is relating to the following products Disclaimer Overview GE863-PRO3Mechanical Dimensions Telit GE863-PRO3module overall dimension areLength 41,4 mm Width 31,4 mm Thickness 3,6 mm GE863-PRO3module connections C2 Vbatt C3 Vrtc DTE GPIO7 / Rftxdisable GSMC11 Simrst C12 Simio D1 Charge D2 VAUX1 D10 GND D11 Simvcc D12 Simclk E1 GND E2 PwrmonPB8 Nrst Reset ARMPB9 ON/OFF*-APPB2 PB0PB1 PB7XIN32 HdmbXOUT32 PA3Reserved GND VBATT2Balls Layout ARM PIO Controller a multiplexing ARM Port IO multiplexingARM PIO Controller B multiplexing ARM PIO Controller C multiplexing Turning on the GE863-PRO3GSM/GPRS Engine Hardware Commands+1,8/5 10kHardware Unconditional Reboot of GSM/GPRS Engine 2Turning OFF the GE863-PRO3GSM/GPRS EngineHardware shutdown Turning ON/OFF the GE863-PRO3ARM ON/OFF*-AP # GND GSM Power Supply Requirements Power SupplyAT+CFUN=1 AT+CFUN=4Vrtc Backup supply ARM Power Supply RequirementsElectrical design Guidelines General Design RulesSuggested circuit is 817A19A Seiko1.1 + 5V input Source Power Supply Design Guidelines 1.2 + 12V input Source Power Supply Design Guidelines Battery Source Power Supply Design Guidelines Battery Charge control Circuitry Design Guidelines GE863-PRO3Hardware User Guide Thermal Design Guidelines Power Supply PCB layout Guidelines GSM Antenna Requirements Antenna50 ohm GSM Antenna PCB line GuidelinesElectro Magnetic Interference Guidelines GSM Antenna installation GuidelinesLogic level specifications Absolute Maximum Ratings -Not Functional Parameter Min MaxOperating Range Interface levels Cmos Level Min Max Cmos 3.1V Current characteristics Level Typical GSM Gpio Current characteristics Level TypicalCmos 1.8V-A Current characteristics Level Typical Operating Range Interface levels Cmos Vrtc Level Min MaxSignal Function Phone resetSignal Min Max Modem Serial Port Modem Serial Port 2 Debug Serial PortsSignals of the GE863-PRO3GSM/GPRS engine serial port are RS232 level translation An example of level translation circuitry of this kind is GE863-PRO3Hardware User Guide Audio Section Overview Short description Input Lines MicrophoneMicmt 1st differential microphone path Input Lines CharacteristicsOutput Lines Speaker Earmt Differential Line-out Drivers Path Output Lines CharacteristicsEvaluation Kit for Telit GE863- PRO3 Modules ON/OFF 10 GSM/GPRS General Purpose I/OUsing a Gpio Pad as Output Using a Gpio Pad as InputUsing the RF Transmission Control GPIO7 10.4Using the Rftxmon Output GPIO3Using the Buzzer Output GPIO4 Using the Alarm Output10.7Indication of network service availability LED statusDevice Status 10.9VAUX1 power output Operating Range VAUX1 power supplyRTC Bypass out 11.1General Mounting the GE863-PRO3on the Application BoardStencil PCB pad DesignSolder paste Following is the recommended solder reflow profile 11.1.4 GE863-PRO3Solder Reflow3C/second max Section A-A Packing SystemModules orientation on tray Moisture Sensibility Conformity Assessment Issues Safety Recommandations Revision Date Changes Document Change Log